I can't comment on the Shad but this is our setup. They are Givi Trekker, n/s is a 46l & the o/s is a 33l. The reason for the different size is that it evens the width out with the high exhaust. (I don't think you will have that problem on the L7?)
They measure a couple of centimetres wider than the bars/mirrors. I wouldn't want to try & filter in a town or city with them on but I find filtering through slow moving traffic on dual carriageways & motorways is OK, so long as you take your time. (We avoid towns & cities when touring anyway)
I just bought some small, cheap bags of eBay that fit fine.
Getting on & off with any pannier fitted will still be awkward & a bit of a technique. I have to lift my leg up & push through the seat rather than 'cock' it over as I do without. I fitted a rack onto the backbox which Deb uses as a purchase, along with my shoulder, to step up onto the rear peg & push her trailing leg through between me & the back box.
The second photo shows the clearance for the foot on the rear peg & the height of the box to clear the passengers thigh. This setup doesn't interfere with any leg room the passenger requires.(we tried a new 1050 complete with OEM boxes for size some time back & found that because they sit so high on the bike they are most uncomfortable for the passenger, pushing against the thigh)
Personally if I was to buy again I think I would go for the top loading type, I'm sure they are easier to load & unload?